英语四级 选择

1.It has been laid down that each student must _____ a composition to the teacher once a week.
　　A. turn in B. give up C. put forward D. bring out
2.Radium salts, which have been found to _____ in bones, give rise to cancers of the bone.
　　A. pile up B. build up C. keep up D. pull up

1.D.2.C.

第一题，"bring out"的意思：1. 拿出;取出.2. 把...带到户外.3. 使出现;使暴露;阐明.4. 出产;出版5. 说出.6. 了解到(真相、秘密)。这里是“拿出”的意思，引申为上交。

第二题，“keep up”是保持的意思。

希望可以帮到你~

D，C